A − 91 dB THD + N, Class-D Piezoelectric Speaker Driver Using Dual Voltage/Current Feedback for Resistor-Less LC Resonance Damping

Journal article (2022)

Authors

S. Karmakar Electronic Instrumentation - EEMCS
Marco Berkhout Goodix Technologies
K.A.A. Makinwa Microelectronics
Q. Fan Microelectronics
Department
Microelectronics
Copyright: © 2022 S. Karmakar, Marco Berkhout, K.A.A. Makinwa, Q. Fan
DOI
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https://doi.org/10.1109/JSSC.2022.3207386
Chopping Audio power amplifier Class-D amplifier Current feedback (CFB) Piezoelectric speakers Push–pull (PP) modulation Resistor-less LC damping
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Published Date

2022

Language

English

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Department

Microelectronics

Abstract

This article presents a Class-D audio amplifier for capacitive
piezoelectric speaker loads. Employing a dual voltage feedback
(VFB)/current feedback (CFB) topology, the amplifier is capable of
damping
LC
resonance without using an external damping resistor, therefore
reducing system power consumption, cost, and size. Additional power
savings are achieved by using a push–pull (PP)-modulated output stage.
To mitigate linearity degradation due to the mismatch of the feedback
resistors, they are dynamically matched by employing choppers. The
prototype, taped out in a BCD 180-nm process, can drive up to 4
μ
F load with a peak current of 4.4 A while achieving an idle power consumption of 122 mW and a peak THD
+
N of
−
91 dB.